I am done

rl/Lib/site-packages/sympy/holonomic/holonomicerrors.py

@@ -0,0 +1,49 @@
+""" Common Exceptions for `holonomic` module. """
+
+class BaseHolonomicError(Exception):
+
+    def new(self, *args):
+        raise NotImplementedError("abstract base class")
+
+class NotPowerSeriesError(BaseHolonomicError):
+
+    def __init__(self, holonomic, x0):
+        self.holonomic = holonomic
+        self.x0 = x0
+
+    def __str__(self):
+        s = 'A Power Series does not exists for '
+        s += str(self.holonomic)
+        s += ' about %s.' %self.x0
+        return s
+
+class NotHolonomicError(BaseHolonomicError):
+
+    def __init__(self, m):
+        self.m = m
+
+    def __str__(self):
+        return self.m
+
+class SingularityError(BaseHolonomicError):
+
+    def __init__(self, holonomic, x0):
+        self.holonomic = holonomic
+        self.x0 = x0
+
+    def __str__(self):
+        s = str(self.holonomic)
+        s += ' has a singularity at %s.' %self.x0
+        return s
+
+class NotHyperSeriesError(BaseHolonomicError):
+
+    def __init__(self, holonomic, x0):
+        self.holonomic = holonomic
+        self.x0 = x0
+
+    def __str__(self):
+        s = 'Power series expansion of '
+        s += str(self.holonomic)
+        s += ' about %s is not hypergeometric' %self.x0
+        return s